Stirring Apparatus

Abstract

An object is to provide a stirring apparatus which can exhibit excellent mixing characteristics and shorten the mixing time. The stirring apparatus includes a stirred tank having a bottomed cylindrical shape, a rotational shaft disposed coaxially or substantially coaxially within the stirred tank, a plate-shaped bottom blade having a lower end edge shaped to conform to a bottom wall surface of the stirred tank, the bottom blade having an opening for communication between one face side and an opposite face side, of the bottom blade, the ratio (h/d) between the blade height h of the bottom blade and the impeller diameter d of the bottom blade satisfies 0.4≦h/d, and the ratio of the opening area to the projection area of the bottom blade as viewed from the rotational direction thereof (opening ratio of the bottom blade) is 10-60%.

1 . A stirring apparatus comprising a stirred tank having a bottomed cylindrical shape, a rotational shaft disposed coaxially or substantially coaxially within the stirred tank, a bottom blade having a plate shape and a lower end edge shaped to conform to a bottom wall surface of the stirred tank, the bottom blade having an opening for communication between one face side and an opposite face side, of the bottom blade, the ratio (h/d) between the blade height h of the bottom blade and the impeller diameter d of the bottom blade satisfies 0.4≦h/d, and the ratio of the opening area to the projection area of the bottom blade as viewed from the rotational direction thereof (opening ratio of the bottom blade) is 10-60%. 
   
   
       2 . The stirring apparatus according to  claim 1 ,
 wherein the opening is formed to have upper and lower sides formed in straight line while being parallel to an upper end edge of the bottom blade, and have opposite lateral sides formed in straight line while being parallel to a lateral end edge of the bottom blade, in which the distance from the upper end edge of the bottom blade to the upper side of the opening and the distance from the lateral end edge of the bottom blade to the corresponding lateral side of the opening are set at the same distance b while satisfying 0.04d≦b≦0.11d with reference to the impeller diameter d.